feat(backend,docker,docs): implement Go/Gin/SQLite REST API server, Docker containerization, and architecture specifications

- Implement standalone Go backend API server using Gin and pure-Go SQLite (modernc.org/sqlite)
- Add 11-table schema DDL migrations (000001_init.up.sql) based on DATA_TABLE.md
- Add seed data ingestion tool (cmd/seed) and static TypeScript content exporter (cmd/export-content)
- Add configuration loader (internal/config) supporting environment variables and .env files (HOST, PORT, DB_PATH, GIN_MODE, CORS_ALLOW_ORIGINS, AUTO_MIGRATE)
- Add lightweight multi-stage Dockerfile and docker-compose.yml with persistent SQLite volume
- Add comprehensive architecture specification (ARCHITECTURE.md) and REST API interface specification (API_INTERFACE.md)
- Harmonize frontend publications page to consume isHighlight flag from database-synced content

backend/internal/repository/standardization.go

@@ -0,0 +1,95 @@
+package repository
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+
+	"git.godopu.com/lab/landing_page/backend/internal/models"
+)
+
+type StandardizationRepository struct {
+	db *sql.DB
+}
+
+func NewStandardizationRepository(db *sql.DB) *StandardizationRepository {
+	return &StandardizationRepository{db: db}
+}
+
+func (r *StandardizationRepository) GetStandardsBodiesWithProjects(ctx context.Context) ([]models.StandardsBodyWithProjects, error) {
+	// Query bodies ordered by display_order
+	bodyQuery := `
+		SELECT id, org, full_name, scope, period, role, display_order
+		FROM standards_bodies
+		ORDER BY display_order ASC, id ASC
+	`
+	bodyRows, err := r.db.QueryContext(ctx, bodyQuery)
+	if err != nil {
+		return nil, fmt.Errorf("query standards bodies: %w", err)
+	}
+	defer bodyRows.Close()
+
+	var bodies []models.StandardsBodyWithProjects
+	bodyMap := make(map[int]int) // body_id -> index in bodies
+
+	for bodyRows.Next() {
+		var b models.StandardsBodyWithProjects
+		if err := bodyRows.Scan(&b.ID, &b.Org, &b.FullName, &b.Scope, &b.Period, &b.Role, &b.DisplayOrder); err != nil {
+			return nil, fmt.Errorf("scan standards body: %w", err)
+		}
+		b.Projects = []models.StandardProjectGroup{}
+		bodyMap[b.ID] = len(bodies)
+		bodies = append(bodies, b)
+	}
+	if err := bodyRows.Err(); err != nil {
+		return nil, err
+	}
+
+	// Query documents ordered by body_id, and preserves curated insertion order with MIN(id) ASC
+	docQuery := `
+		SELECT id, body_id, wg, project_name, title, doc_ref, status, published_at
+		FROM standard_documents
+		ORDER BY body_id ASC, id ASC
+	`
+	docRows, err := r.db.QueryContext(ctx, docQuery)
+	if err != nil {
+		return nil, fmt.Errorf("query standard documents: %w", err)
+	}
+	defer docRows.Close()
+
+	// Group documents into projects under each body preserving curated order
+	type projectKey struct {
+		bodyID      int
+		wg          string
+		projectName string
+	}
+	projectMap := make(map[projectKey]int) // projectKey -> index in bodies[bIdx].Projects
+
+	for docRows.Next() {
+		var d models.StandardDocument
+		if err := docRows.Scan(&d.ID, &d.BodyID, &d.WG, &d.ProjectName, &d.Title, &d.DocRef, &d.Status, &d.PublishedAt); err != nil {
+			return nil, fmt.Errorf("scan standard document: %w", err)
+		}
+
+		bIdx, bodyExists := bodyMap[d.BodyID]
+		if !bodyExists {
+			continue
+		}
+
+		key := projectKey{bodyID: d.BodyID, wg: d.WG, projectName: d.ProjectName}
+		pIdx, projExists := projectMap[key]
+		if !projExists {
+			pIdx = len(bodies[bIdx].Projects)
+			bodies[bIdx].Projects = append(bodies[bIdx].Projects, models.StandardProjectGroup{
+				WG:        d.WG,
+				Name:      d.ProjectName,
+				Documents: []models.StandardDocument{},
+			})
+			projectMap[key] = pIdx
+		}
+
+		bodies[bIdx].Projects[pIdx].Documents = append(bodies[bIdx].Projects[pIdx].Documents, d)
+	}
+
+	return bodies, docRows.Err()
+}